Flue-expander for expanding the flue-joints of boilers.



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UNITED STATES Patented vOctober 20, 1903.

PATENT OFFICE.

FLUE-EXPANDER FOR EXPANDING THE FLUEJOINTS 0F toutes; 1

SPECIFICATION forming part of Letters Patent No. 741,636, dated october26, 190e'.

Application sied August t, 1902.

To a/ZZ whom t may concern.-

Be it knownA that we, WILLIAM E. DONE- HOWER and SAMUEL OHILSON,citizens of the United States, residing at Omaha, in the county ofDouglas and State of Nebraska,have invented certain new and usefulImprovements in Flue-Expanders for Expanding the vthe rollers urgedoutward by the tapered drive-pin the joint is better and more easilyexpanded.

Other objects and advantages of the invention will hereinafter appearand the novel features thereof will be specifically defined by theappended claim. Y

The invention in its preferred form is clearly illustrated in theaccompanying drawings, which,with the numerals of reference markedthereon, form a part of this specification, and in which- Figure 1 is anelevation of the device cornplete with the tapered driving-pin removed.Fig. 2 is a centrallongitudinal section through the body portion of theexpander. Fig. 3 is an elevation of the screw-cap. Fig. 4 is a top planthereof. Fig. 5 is a top view of the guide. Fig. 6 is a side elevationthereof. Fig. 7 is a top viewof the body portion of the expander. Fig. 8is a view of one of the tapered rollers removed. Fig. 9 is a similarview of one of the grooved rollers. Fig. 10 is a view of the tapereddriving-pin.

Like numerals of reference indicate like parts throughout the severalviews in which they appear.

Referring now to the drawings, 1 designates the body portion of theexpander, which is provided with the longitudinal openings 2, throughwhich the rollers project, and with serai No. 118,462. (No matti thecentral bore 3 for the passage of the drivi ing-pin. It is formed at itsupper end with an interiorly-screw-threaded ring portion having thethreads 5, as seen best in Fig. 2, and with the foursubstantially'circular openings 6, in which the rollers are adapted tobe received, as will hereinafter appear.

7 is the guide. It is provided with the oppositely-disposed dependingportions 8, which embrace opposite sides of the body portion, as seenbest in Fig. 1, and has the central opening 9, the portion 10, restingupon the top of the body portion, and the'screw-cap 11, having thepolygonal portion 12 and depending screw-threaded portion 13 to engagethe threads 5 of the body portion, tits over the same and holds theguide in place,-as is seen clearly in Fig. 1. This cap has the eentralopening 14. for the passage of the tapered driving-pin.

15 represents tapered rollers, of which there l are two, only one ofwhich, however, can be seen in Fig. 1, and 16 representsthe groovedrollers, of which there are two, both 0f which are shown in said Fig. 1.They are each provided with a projecting stem 17, as shown in ,Figs 8and 9.

18 is the tapered driving-pin. In practice the parts are assembled asseen in Fig. 1, the two grooved rollers beingadja-v cent and the twotapered rollers being next to each other. Instead ,of depending upon'the taper of the driving-pin we arrange the Iadditional pressure isobtained and exerted by the shoulders ofthe saidrollers, as will beevident from Fig. l.

From the above itwill be seen that we have I devised a novel and cheapyet efcieut form of fine-expander, and while the -structural embodimentof the invention as herein disclosed is what we at thepresent timeconsider vthe preferable one it is evident that the same is subject tochanges, variations, and modifications without departing from the spiritof the invention or sacrificing any of its advantages, and we thereforereserve the roo right to make such changes, variations, andmodifications as come properly within the scope of the protectionprayed.

What is claimed es new is- The fine-expander herein described,oonsisting of the body portion having the lower reduced or small ring,the series of vertical slots and the upper enlarged collar havinginterior screw-threads, a, series of grooved and a series of smoothrollers mounted on the seid slots, the guide fitting in the upper col-1er of the body portion and having the pair of depending portionsembracing opposite sides of the body portion, the fianged screwcaphaving the flange resting on the guide and the threads engaging thethreads of the collar and the tapered driving-pin.

In testimony whereof we afx our signatures in presence of two witnesses.

WILLIAM E. DONEHOWER.

SAMUEL CHILSON.

Witnesses:

I-I. A. STURGES,

LOUIS MIKKLESEN.

